THE RUSTS ON FRITILLARIA 
3. Uromyces Miurae Sydow, Ann. Myc. 11: 94. 1913- 
O and I. Pycnia and aecia, unknown. 
III. Telia amphigenous, petiolicolous, numerous, occasionally 
crowded in groups of two or three sori, round or broadly ellipsoid, 
0.2-0.7 mm. across, tardily naked, finally dehiscent by longitudinal 
rents in the epidermis, pulvinate, becoming pulverulent, cinnamon- 
brown, ruptured epidermis conspicuous; teliospores rather narrowly 
and irregularly ellipsoid to terete, 14-23 by 24-35 /x, rounded or taper- 
ing at apex, usually tapering at base; wall golden to cinnamon-brown, 
of uniform thickness (1.5-2 m), a low (1.5-3 m), hyaline apiculus at 
apex, moderately and very inconspicuously verrucose, markings 
arranged to form longitudinal striations, appearing almost smooth 
when wet; pedicel very short, fragile, a sac-like swelling at point of 
attachment with spore. 
On Liliaceae: Fritillaria Kamtschatcensis Ker. Alaska, British 
Columbia, Japan. Fritillaria lanceolata Pursh. Washington. 
Type locality: Mt. Shirouma, prov. Shinano, Japan on' Fritil- 
laria Kamtschatcensis. 
Fig. 2. Teliospores of Uromyces infrequens showing optical sections and surface 
view. X 625. 
Distribution: South-central and east-central Washington north- 
westward through Vancouver and Queen Charlotte islands to south- 
eastern Alaska; also in central Japan. 
ExsiccATi: Ellis & Ev. N. Am. Fungi 1863. 
It is impossible of course with only the telial stage present to assign 
this species with certainty to any genus in the classification based on 
the length of life-cycle, proposed by Arthur.^ However, in spite of 
the lack of positive evidence which would indicate its proper taxonomic 
^ Eine auf die Struktur und Entwicklungsgeschichte begriindete Klassifikation. 
Result. Sci. Congr. Bot. Vienne 331-348. 1906. 
